Frost-forming preventer.



M. S. SHANKS & W. J. NICKELL.

FROST FORMING PREVENTER.

-APPLICATION FILED JAN. 30. 1911.

Patented Dec. 4, 1917.

ATTORNEY Y INVENTO'R WITNESSES U D erarns rarnivr opt MATTHEW S. SHANKS AND XVILIlh IAM J. NICKELL, 0F GENTEEVILLE,-IQWA.

' FROST-FORMING PREVEN'I'ER.

Specification of Letters Patent.

Patented Dec. d, 191 7.

' Application filed January 30, 1917. Serial No. 145,561.

To all whom it may concern:

Be it known that we, MATTHEW S. Snnnns and WILLIAM J. NIoKnLL, citizens of the United States, residing at Center-ville,

in the county of Appanoose and State of like, the object being to provide improved devices of this kind which are cheap and simple in construction and which can be readily applied to a window.

The invention consists in the construction, combination and arrangement of devices, hereinafter described and claimed. 7

In the accompanying drawings Figure l is a vertical sectional View of a window provided with frost preventing clevices constructed and arranged in accordance with our invention. 7

Fig. 2 is an elevation of the same, showing the inner side or rear side of the window.

Fig. 3 is a detailed vertical sectional view on the plane indicated by the line 33 of Fig. 2.

Fig. 4 is a detailed transverse sectional view on the plane indicated by the line L4i of Fig. 2.

The window frame or sash 1 may be of any suitable construction-and in accordance with my invention an opening 2 is provided across the upper end of the glass pane 3. As here shown the upper end of the glass pane is spaced from the upper side of the sash or frame to provide said opening 2 but the opening may be otherwise formed or provided within the scope of my invention. On the front or outer side of the sash at the upper end thereof is a hood which. eX- ten ds there-across and also covers the opening 2 and. the upper portion of the pane.

On the rear or inner side of the sash at its upper end is a downwardly directed de a sheet of metal but may be of any suitable constructlon.

On opposite sides of the sash at the rear side thereof are vertically arranged ducts 7 which are formed of sheet metal and are providedwith outturned flanges 8 secured to the sides of the sash by nails, screws or other like fastening devices. These ducts contract downwardly and communicate at their upper ends with the openings 6 of the deflector plate so that said openings c0nsti- 'tute the air intakes of the ducts. The ducts are closed at their lower ends and also the opposite sides excepting for the provision of narrowair discharge openings 8 at their opposing sides and intermediate and spaced from their upper and lower ends.

In the operation of our improved frost preventing devicethe current ofair which is taken in through the opening at the top of the pane strikes the deflector and is directed downwardly thereby in close proximity to and at the rear side of the pane. Some of the air current also enters the upper ends of the ducts 7 through the openings 6 and the corresponding openings in the sides of the sash and is forced downwardly through the ducts. Owing to their downwardly contracting construction the ducts accelerate the downwardly directed currents of air therethrough, and the open ings in the opposing sides of the air ducts cause air currents to be directed transversely across and in rear of the glass pane so that the r ar or inner side of the glass pane is kept at such a low temperature that moist atmosphere in the cab or car is prevented from condensing on the glass panes and hence the formation of frost thereon is also prevented. The hood serves to prevent the entrance of rain, snow hail or the like as will be understood.

While we have herein shown and described a preferred form of our invention we would have it understood that changes may be made in the form, proportion and construction of the several parts, without departing from the spi it of our invention and within the scope of the appended claim.

Having thus described our invention, what we claim is In a window, a progressively downwardly contracting duct ar anged on the rear or inner side of the Window at one side of the its upper larger end and being closed at its glass pane and provided at one side with a lower end. 7

narrow air discharge opening extending In testimony whereof We afiix our signa,- 1Q; along'the greater part of the length of the tures. I

duct to direct air currents transversely across the rear or inner side or" the pane, MATTHEW S. SHANKS.

said duet having an air intake opening at WILLIAM J. NIGKELL.

Copies of this patent may he obtained for five cents each, by addressing the Commissioner-of Patents. Washington, D. G." 

